I'm in the middle of replacing the cam chain on my 05 660, have the new chain in,have the crank and cam on all timing marks, and I cannot get the cam chain tensioner bolted on. The spring and center bolt is out of it, and I can't get the housing of the tensioner to come close to being able to bolt up before the chain comes tight. The plunger is also reset all the way back in it, the chain is seated fine on both sprockets, and the chain guides are both in the right position. Anyone else have this problem? The old chain was not a whole lot shorter than the new one and it was 4 clicks on the tensioner from being all the way out when I took it put. I'm stumped, does the valve cover hold the cam down tighter into the journals? The cam seems to be sitting all the way down, I need to get slack in the new chain somehow to get that tensioner bolted back on.